package com.example.demo.map;

import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

public class TestCCMap {
    public static void main(String[] args) {
        Map map = new ConcurrentHashMap();
        Set set = map.keySet();
        set.forEach(System.out::println);

    }
}
